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Wiseco PK1855 Forged Piston Kit Honda Bore - XR/CRF50 39.5mm 4798M

(2004-2009, 2011-2013 Honda CRF50F; 2000-2003 Honda XR50R)

Part of: Wiseco Pistons Forged Piston Kit Suzuki

Other options in this family: Wiseco Pistons SK1036 Wiseco Pistons 755M05600 Wiseco Pistons SK1205 Wiseco Pistons 40105M09900 Wiseco Pistons 4576M08200

Manufacturer

Picture for manufacturer Wiseco Pistons

Part Number

PK1855
14 reviews
Sale Price

$156.99

Estimated ship date Sunday, November 22

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Product Details

The Wiseco PK1855 is a complete forged piston kit designed for Honda XR50 and CRF50 engines from 1988 to 2013, featuring a 39.5mm bore diameter (bore code 4798M). Built for performance-minded riders looking to restore or upgrade their small-bore Honda 4-stroke, this kit delivers the strength and precision Wiseco is known for.

Key Features:

  • Forged from high-silicon, low-expansion aluminum alloy for superior strength, reduced weight, and improved heat transfer compared to cast alternatives
  • Innovative forging design and optimized piston skirt geometry engineered to maximize horsepower and torque output
  • Complete kit includes: forged piston, piston rings, wrist pin, and circlips — everything needed for a full top-end rebuild
  • Dedicated forging designed and built specifically for the Honda XR50/CRF50 engine application
  • Manufactured entirely in-house using Wiseco's proprietary forging process for tight tolerances and consistent quality
  • Compatible with cast iron, chrome, Nikasil, and boron composite cylinder bore compositions
  • Oversize piston — cylinder sleeving is required for proper installation

Wiseco is the only aftermarket piston manufacturer in the United States that produces pistons exclusively using the forging process, ensuring each piston delivers the toughness and durability demanded by high-performance powersports applications. The PK1855 is an ideal choice for mini bike enthusiasts rebuilding or hot-rodding their Honda 50cc platform.

Products specifications

Fits

2004-2009, 2011-2013 Honda CRF50F; 2000-2003 Honda XR50R

So far best price. As long as everything fits as it should I'm 100. Better pic would have helped, thought it was a 32" flex line. Not a 8" on a piece of hard line

Price of product is fine shipping was harsh!

So far, I really enjoyed the speedy checkout and great prices.

Ordered an Fabtech steering box skidplate, best price I could find on the net was Autoplicity. Price was better than all the 4x4 sites I checked. Item is shipping directly from Mfg, so really can't comment on shipping speed. Otherwise, transaction was easy and I really like the fact they accept PayPal.

It was quick and easy.

I've used Autoplicity before and I love their excellent prices and same day shipping!

Very good

The product image/description is not consistent with the manufacturer's product ID number. Please see www.bd-power.com for descriptions for item no. 1036606 vs. 1301185. The item was ordered based on manufactuer's item number. The correct product was re

Excelente..

The prices are great. Shipping is so so, but that's normal for Alaska

Easy to use site.

Good so far

Great prices and communication, fast shipping. What more could you want or expect from a company?

easy

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